The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Joules to Gigajoules
Convert Joule (J) to Gigajoule (GJ) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) to gigajoules (GJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
GJ = J × 1.000000000e-09
Results update instantly for Joules to Gigajoules conversions.
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Formula
GJ = J × 1.000000000e-09
J = GJ × 1000000000
Conversion table
| 1 J | 1.000000e-09 GJ |
| 5 J | 5.000000e-09 GJ |
| 10 J | 1.000000e-08 GJ |
| 20 J | 2.000000e-08 GJ |
| 50 J | 5.000000e-08 GJ |
| 100 J | 1.000000e-07 GJ |
| 500 J | 5.000000e-07 GJ |
| 1000 J | 0.000001 GJ |
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How the formula works
Both joule and gigajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 1.000000000e-09 to get gigajoules. To reverse the conversion, multiply a gigajoule value by 1000000000 to get back to joules.
Frequently asked questions
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
What is Gigajoule (GJ)?
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
How do I convert joules to gigajoules?
Multiply the joule value by 1.000000000e-09 to get the equivalent in gigajoules. For example, 5 J × 1.000000000e-09 = 5.000000e-09 GJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-09 is an exact, non-rounded value.
Can I convert gigajoules back to joules?
Yes. Divide the gigajoule value by 1.000000000e-09, or multiply it by 1000000000, to get joules.
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About converting joules to gigajoules
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter. A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
Use this calculator to move between joules and gigajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.